Electric incandescent lamp



Jan. 1, 1935. G. CHELIOTI 1,985,915

ELECTRIC INCANDESCENT LAMP Filed Jan. 6, 1955 I E N 0 R E'E'UR GE CHEL [U T2 His ATTUBNEY' Patented Jan. 1, 1935 PATENT OFFICE ELECTRIC IN CANDE SCENT LAMP George Chelioti, London,

England, assignor to General Electric Company, a corporation of New York Application January 6, 1933, Serial No. 650,556 In Great Britain January 6, 1932 4 Claims.

My invention relates to electric incandescent lamps, and more particularly to projection lamps. Still more particularly my invention relates to means for supporting the filaments therein.

The object of my invention is to provide a means of supporting and arranging filaments which is simple and reliable. Accordingly, the arrangement comprises a number of straight coiled filaments each mounted directly on rigid metal support wires which are sealed in the stem press of the lamp. The preferable arrangement consists of a plurality of short lengths of coiled coilfilaments disposed vertically and parallel to each other and each attached at the upper end directly to short horizontal end portions of vertically disposed support wires mounted on the 1 stem press of the lamp. The lower ends of said filaments are also attached directly to shorter support wires mounted on the stem press. The said support wires may be connected to leadingin wires in accordance with a desired filament arrangement. One of the features of my invention is the elimination of anchor wires, spring supports and insulating beads. Other features and advantages of my invention will appear from the following detailed description of species thereof.

In the drawing, Fig. 1 is an elevation of a lamp comprising my invention; Figs-2 and 3 are diagrammatic elevations of filament arrangements and supporting means.

' Referring to Fig. 1, the lamp comprises a base 10 and bulb 11, preferably filled with an inert gas such as argon or nitrogen or a mixture thereof. Referring specifically to Fig. 2, coiled coil filaments 12, 13, 14, 15, of tungsten or other refractory metal wire, are preferably arranged in a vertical plane parallel to one another. Support wires 16-17 which may be of nickel, are mounted at one end in the stem press 18 of the lamp, and extend upward along each side of the group of filaments, terminating in short inwardly bent, horizontal end portions 1920. The filaments 12-13 are connected at their upper ends, as by welding, to the horizontal portion 19 of support wire 16 and filaments 14-15 are connected at their upper ends to the horizontal portion 20 of the support wire 1'7. The lower ends of filaments 1314 are connected to the horizontal end portion 21 of a vertically disposed support wire 22, the other end of which is sealed in the stem press 18. The lower ends of filaments 12 and 15 are connected to the ends of vertically disposed support wires 23 and 24 respectively, the ends of which are sealed in the stem press 18 and-are connected to leading-in wires, thus connecting the filaments 12 to 15 in series.

In an alternative hook-up, a third leading-in wire may be connected to the support wire 22 so 5 that filaments 12 and 13 could be connected in circuit alone or in multiple with the filaments 14 and 15.

In Fig. 3, the lower end of filament 12 is connected to the vertical end of a support wire 25 10 which is bent horizontally and mounted on the support wire 24. In this arrangement, the sup- 7 port wires 22 and 24 are connected to leading-in wires, thus providing a series-multiple circuit, filaments 12-13 being in multiple with filaments 15 14-15.

What-I claim as new and desire to secure by Letters Patent of the United States is:

1. In an electric incandescent lamp, 9. plurality of separate'filaments vertically ,tlisposed 20 side by side, support wires extending vertically upward alongside of said filaments and each having a short inwardly extending horizontal portion at the upper end, the upper ends of pairs of said filaments being connected to the horizontal :5 portion of each of said support wires, a shorter I vertically extending support wire having ahorizontally extending portion at the upper end thereof, the lower ends of one of the filaments of at least two of said pairs being connected to said 30 horizontal portion of said shorter support wire, and the lower ends of the other filaments of said pairs being mounted on separate vertically extending support wires. 7

2. In an, electric incandescent lamp, a plurality of separate filaments vertically disposed side by side, a pair of support wires extending vertically upward alongside of said filaments and each having a short inwardly extending horizontal portion at the upper end, the upper ends of each of a pair of said filaments being connected to the horizontal portion of each of said support wires, a shorter vertically extending support wire having a horizontally extending portion at the upper end thereof, the lower ends of one of the Y filaments of each of said pairs being connected to said horizontal portion of said shorter support wire, and the lower ends of the other filaments of said pairs being mounted on separate vertically, extending support wires.

3. In an electric incandescent lamp, a plurality of separate filaments vertically disposed side by side, a pair of support wires extending vertically upward alongside of said filaments and each having a short inwardly extending horizontal portion 55 2 attheupperend,-theupperendsoieachofa pair of said filaments being connected to the horizontal portion of each of said support wires, a shorter vertically extending support wire having a horizontally extending portion at the upper end thereof, the lower ends of one o! the filaments of each of said pairs being connected to said horizontal portion of said shorter support wire, and the lower ends of the other filaments of said pairs being mounted on separate vertically extending support wires which are connected to leading-in wires, thus connecting all of said separate filaments in series.

4. In an electric incandescent lamp, a plurality of separate filaments vertically side by side, a pair or support wires extending vertically upward alongside of said filaments and each havsing a short inwardly extending horizontal portion at the upper end, the upper ends 0! each of a pair or said filaments being connected to the horizontal portion or each oi said support wires, a shorter vertically extending support wire having a horizontally extending portion at the upper end thereof, the lower ends of one of the filaments of each oi! said pairs being connected to said horizontal portion of said shorter support wire, and the lower ends of the other filaments of said pairs being mounted on separate vertically extending support wires which are connected together to a leading-in wire, said shorter support wire which has the other two filaments of Gnome cum-Ion. 

